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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2014 Fair Value Level 1 | Dec. 31, 2013 Fair Value Level 1 | Mar. 31, 2014 Fair Value Level 1 Retail | Dec. 31, 2013 Fair Value Level 1 Retail | Mar. 31, 2014 Fair Value Level 2 Institutional and Other | Dec. 31, 2013 Fair Value Level 2 Institutional and Other | Mar. 31, 2014 Fair Value U.S. Treasury Notes Level 1 | Dec. 31, 2013 Fair Value U.S. Treasury Notes Level 1 | Mar. 31, 2014 Book Value | Dec. 31, 2013 Book Value | Mar. 31, 2014 Book Value Retail | Dec. 31, 2013 Book Value Retail | Mar. 31, 2014 Book Value Institutional and Other | Dec. 31, 2013 Book Value Institutional and Other | Mar. 31, 2014 Book Value U.S. Treasury Notes | Dec. 31, 2013 Book Value U.S. Treasury Notes | Mar. 31, 2014 Institutional and Other Minimum | Mar. 31, 2014 Institutional and Other Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 872,910 | $ 830,014 | $ 766,700 | $ 740,481 | $ 872,910 | $ 830,014 |  |  |  |  |  |  | $ 872,910 | $ 830,014 |  |  |  |  |  |  |  |
Short-term investments | 40,056 | 50,104 |  |  |  |  |  |  |  |  | 40,056 | 50,104 |  |  |  |  |  |  | 40,056 | 50,104 |  |
Long-term debt |  |  |  |  |  |  | $ 1,170,617 | $ 1,048,010 | $ 536,843 | $ 512,635 |  |  |  |  | $ 1,178,250 | $ 1,178,250 | $ 537,408 | $ 537,454 |  |  |  |
Fair value assumption, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 6.91%

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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